Triple Chocolate Mousse Cake

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

Chocolate Mousse was one of the very first recipes I tried to make, way back when I was a middle schooler. Making a quintessentially French dish was an assignment for my French class, so I set off with a copy of Time Life Books: classic French cooking and did my best. Which wasn’t very good. Actually, it was terrible. The recipe called for coffee, which at the time, before I became an avid consumer of the beverage, was a confusing ingredient. Did they mean coffee grounds or brewed coffee. Well, I chose very wrong and went with the grounds, probably because I didn’t know how to brew coffee. It was like eating chocolate with sand in it. Not good. I made it again with brewed coffee and it was a revelation. The texture was like silk, the taste of the chocolate was so rich and luscious, unlike anything I’d every eaten. It was like a very distant cousin to chocolate pudding, but altogether superior. I was so proud that I’d made something this delicious. It was one of the first times I was excited about a school assignment and it set me off on more baking adventures.

When Fanny sent me her book, I flipped through it, saw her Triple Chocolate Mousse Cake and I knew it was the one I would make. This recipe is traditional in that it uses uncooked eggs; whipping both the whites and the yolks separately and folding them into the chocolate. The result is glorious. For those who are squeamish about using raw eggs in a recipe, you can find pasteurized eggs, which are deemed safe to eat without cooking. I used fresh eggs from my neighbor’s chickens and it was not only exquisite, but I am also still here to talk about it.

Fanny’s recipe was pure and simple, which is a lovely thing in a day of over complicated recipes, but I decided to add a bit of coffee flavor to the Triple Chocolate Mousse Cake, to recreate the flavor of my childhood memory.

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

Triple Chocolate Mousse Cake

by Fanny Lam from Oh Sweet Day!Chocolate Sponge Cake

1/2 cup (65g) all-purpose flour

2 tablespoon cocoa powder (I used Droste Cocoa Powder)

1/4 teaspoon salt

3 large eggs, room temperature

1/2 cup (113g) granulated sugar

1 tablespoon oil

1/2 tsp vanilla extract (make your own)

For soaking the baked cake layer:

Coffee soak – 2 tablespoons BREWED coffee mixed with 2 tablespoons simple syrup

(to make simple syrup bring 1/4 cup sugar and 1/4 cup water to a simmer and cook until all the sugar is dissolved)

Chocolate Mousse

200g dark chocolate, finely chopped

1 tablespoon butter

1/4 cup water (or use coffee or a coffee flavored liqueur, like Kahlua)

3 eggs, separated

1 tablespoon granulated sugar

1 cup heavy cream

Chocolate Ganache

100g dark chocolate, finely chopped

1/3 cup heavy whipping cream

1 tablespoon Kahlua

Topping 

Chocolate curls

To make the chocolate sponge: Watch me make the cake in my instagram video

  1. Preheat oven to 325°F. Line an ungreased 8 inch Cake Pan with parchment paper
  2. In a bowl, sift together the flour, cocoa powder and salt.
  3. In a stand mixer, whip the eggs with the sugar until pale and when you pull the whip out of the foam it creates a ribbon that sits on the surface for a couple of seconds before blending in. Mix the flour into the egg foam, using the whip (I do this by hand, as you’ll see in my instagram video) on low speed.
  4. In a small bowl, put about 1/3 a cup of the batter. Mix in the oil and vanilla to the small bowl of batter. Fold that mixture into the large amount of batter.
  5. Pour the batter into the prepared pan and smooth out the top. Bake for about 20-25 minutes or until a tester comes out clean.
  6. Remove from oven, allow to cool in the pan for 10 minutes, then run a knife around the edge of the pan, remove the cake from the pan and cool complete.
  7. Once the cake was cool, I cut the cake in half, so I had two disks of cake, because I wanted a smaller ratio of cake to mousse. Fanny used the whole cake.
  8. Fit the cake into an 8 inch springform cake pan. I used Acetate Clear Cake Strips to make it easier to remove from the pan. 
  9. Brush the top of the cake lightly with the coffee soak.

To make the chocolate mousse:

  1. Combine the chocolate, butter and coffee in a bowl set over a pan of simmering water, to make a double boiler. Turn off the heat and gently stir until smooth. Allow to cool slightly.
  2. In a stand mixer, whip the egg whites until foamy. Add the sugar and continue whipping until the whites are medium peaks form (see my meringue video on instagram for a diagram of medium peaks). Transfer to another bowl.
  3. Using the same bowl whip the egg yolks until pale and fluffy, about 3 minutes. Slowly add the chocolate mixture.
  4. Fold the whites into the chocolate mixture in 3 additions.
  5. Whip the heavy whipping cream to soft peaks. Fold the cream into the chocolate  mixture.
  6. Pour the mousse over the cake in the springform pan. Shimmy the pan to make sure the mousse settles flat in the pan.
  7. Allow to set for several hours or overnight.

To make the ganache:

Heat the cream and Kahlua in a pan, turn off the heat and add the chocolate. Swirl the pan so the chocolate is submerged and allow to sit for 3 minutes. Gently stir until smooth. Pour the mixture over the cake. Refrigerate for at least 10 minutes, but you can do this a day ahead.

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

Triple Chocolate Mousse Cake | ZoeBakes photo by Zoë François

5.0 from 1 reviews
Triple Chocolate Mousse Cake
Author: 
Recipe type: Desserts
 
Fanny's recipe was pure and simple, which is a lovely thing in a day of over complicated recipes, but I decided to add a bit of coffee flavor to the Triple Chocolate Mousse Cake, to recreate the flavor of my childhood memory.
Ingredients
  • Chocolate Sponge Cake:
  • ½ cup (65g) all-purpose flour
  • 2 tablespoon cocoa powder (I used Droste Cocoa Powder)
  • ¼ teaspoon salt
  • 3 large eggs, room temperature
  • ½ cup (113g) granulated sugar
  • 1 tablespoon oil
  • ½ tsp vanilla extract
  • For soaking the baked cake layer:
  • Coffee soak - 2 tablespoons BREWED coffee mixed with 2 tablespoons simple syrup
  • Chocolate Mousse:
  • 200g dark chocolate, finely chopped
  • 1 tablespoon butter
  • ¼ cup water (or use coffee or a coffee flavored liqueur, like Kahlua)
  • 3 eggs, separated
  • 1 tablespoon granulated sugar
  • 1 cup heavy cream
  • Chocolate Ganache:
  • 100g dark chocolate, finely chopped
  • ⅓ cup heavy whipping cream
  • 1 tablespoon Kahlua
  • Topping:
  • Chocolate curls
Instructions
  1. Chocolate sponge: Preheat oven to 325°F. Line an ungreased 8-inch Cake Pan with parchment paper.
  2. In a bowl, sift together the flour, cocoa powder and salt.
  3. In a stand mixer, whip the eggs with the sugar until pale and when you pull the whip out of the foam it creates a ribbon that sits on the surface for a couple of seconds before blending in. Mix the flour into the egg foam, using the whip (I do this by hand, as you'll see in my instagram video) on low speed.
  4. In a small bowl, put about ⅓ a cup of the batter. Mix in the oil and vanilla to the small bowl of batter. Fold that mixture into the large amount of batter.
  5. Pour the batter into the prepared pan and smooth out the top. Bake for about 20-25 minutes or until a tester comes out clean.
  6. Remove from oven, allow to cool in the pan for 10 minutes, then run a knife around the edge of the pan, remove the cake from the pan and cool complete.
  7. Once the cake was cool, I cut the cake in half, so I had two disks of cake, because I wanted a smaller ratio of cake to mousse. Fanny used the whole cake.
  8. Fit the cake into an 8 inch springform cake pan. I used Acetate Clear Cake Strips to make it easier to remove from the pan. Brush the top of the cake lightly with the coffee soak.
  9. Chocolate mousse: Combine the chocolate, butter and coffee in a bowl set over a pan of simmering water, to make a double boiler. Turn off the heat and gently stir until smooth. Allow to cool slightly.
  10. In a stand mixer, whip the egg whites until foamy. Add the sugar and continue whipping until the whites are medium peaks form (see my meringue video on instagram for a diagram of medium peaks). Transfer to another bowl.
  11. Using the same bowl whip the egg yolks until pale and fluffy, about 3 minutes. Slowly add the chocolate mixture.
  12. Fold the whites into the chocolate mixture in 3 additions.
  13. Whip the heavy whipping cream to soft peaks. Fold the cream into the chocolate mixture.
  14. Pour the mousse over the cake in the springform pan. Shimmy the pan to make sure the mousse settles flat in the pan. Allow to set for several hours or overnight.
  15. Ganache: Heat the cream and Kahlua in a pan, turn off the heat and add the chocolate. Swirl the pan so the chocolate is submerged and allow to sit for 3 minutes. Gently stir until smooth. Pour the mixture over the cake. Refrigerate for at least 10 minutes, but you can do this a day ahead.